Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a799b3d6f77646…

MALICIOUS

PDF

73.7 KB Created: 2021-09-03 03:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fea3b92237e47db857883987c15156d2 SHA-1: c031985d1b91d28b95032cf2be13ac6c4ec3a689 SHA-256: 36a799b3d6f776461e853e30dd26aec71f7c38a85b1317e1e629c9ed7980a628
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, suggesting an attempt to redirect users to malicious content. The heuristic 'SE_CALLBACK_LURE' indicates the document may be designed to trick users into calling a fraudulent support number. While no scripts were directly extracted, the presence of malformed streams and ML classification strongly suggest malicious intent, likely to lead users to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 7

  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pixomot.ru/uplcv?utm_term=free+double+digit+addition+and+subtraction+coloring+worksheets PDF link annotation
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/0918eb60cbfe13f2ad5feea82512c51c/xakisudazunukawife.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa81b0e8df---begumerimilenafaliririb.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/n2f0st4mfhukttq2vogb1r17v6/jexeduw.pdfIn PDF document text
    • http://guchenes.com/d/files/40203609849.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d644ce1ce5770994fa35a868b56b842d/suwuw.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861de3dba40---87682141357.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/c7f7b6278d16ef62089b817783ca6797/vemasutuwefinogor.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610ecda22f45e---62671344336.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/lapali.pdfIn PDF document text
    • http://ellev.fr/upload/files/zogoribososurikovason.pdfIn PDF document text
    • https://haidangpc.com/contents/files/kalulavivapimede.pdfIn PDF document text
    • http://robertsrucker.com/clients/7/7f/7f5ecd1287ec2152c36a7dc1808edcbf/File/33768456446.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/161ea4b036799cddaa5d3d94d4a8a40f/doselesewazusuwizefus.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/47f5571e40a781189730f5a2de6705f2/83925136393.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/sironapagolokekek.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/zuxurani.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/54315338044.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/7p2nf90ig3hnp547jsc93031e4/wimasibitafafupefudifilen.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/powufodewifogawed.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/bifarakivabijijinax.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710b0ae63f2---zedovutukiku.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210801004726.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/89283619358.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a385b7a49bc---22051769403.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fadd41c1---bilimiza.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/11040493106.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC046 11044 bytes
SHA-256: 8669f300f556ad9656183014204dd110c579612d547e0a5874f3b4bc0b682ec9
font_01_sfnt_off0000d9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BA 15168 bytes
SHA-256: 303396631b7fb27aa3fcab783f02b7d37bb1c37fb1d5b588b6a0b37b1c0e1c07
font_02_sfnt_off0001006b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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